


In-depth discussion: Memory usage of formal parameters in Go language
Go语言中形参在栈上创建,生命周期与函数调用范围相同。基本类型占用8字节,指针占用8字节(32位系统4字节),结构和数组占用与类型定义匹配的字节数。实际用例中,形参指针指向堆上数组数据,栈上仅占用8字节。
In-depth discussion: Memory usage of formal parameters in Go language
在 Go 语言中,当函数被调用时,它的形参将在栈上创建。理解形参的内存占用情况非常重要,因为它可以帮助我们优化代码的性能。
形参变量的生命周期
Go 语言形参变量的生命周期与函数调用的范围相同。当函数返回时,形参变量将被销毁,它们的内存将被回收。例如:
func myFunction(x int) { x *= 2 }
在这个例子中,x
是一个形参变量,它的生命周期仅限于 myFunction
的调用范围内。
形参内存占用大小
形参变量的内存占用大小取决于其类型。基本类型(如 int
、float64
和 bool
)占用 8 字节,指针占用 8 字节(在 32 位系统中占用 4 字节),结构和数组则占用与类型定义匹配的字节数。
实战案例
下面的代码展示了一个使用形参类型的实际用例:
func sumArray(arr []int) int { sum := 0 for _, v := range arr { sum += v } return sum }
在这个例子中,sumArray
函数接受一个整型数组作为形参。形参变量 arr
是一个指针,它指向实际的数组数据。因此,arr
变量在栈上的内存占用仅为 8 字节,而实际的数组数据则存储在堆上。
结论
理解 Go 语言形参的内存占用情况对于优化函数性能至关重要。通过利用栈和堆之间的关系,我们可以创建高效且灵活的代码。
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